[DSII] Dozy question re: Command/Communications

Maybe I'm being dense or something but what are the rules concerning
Command/Communications systems? We know how much space they take up in a
vehicle and what they cost but what are they used for? Why should one
have one except to provide an expensive target? Page 6. Command Control
and communications talks about them but that's it. I don't recall
anything in the assorted FAQ about them.

I am being blind or stupid?
Cheers
-- 
Symon Cook (founder member of Camros)(The Campaign for Real Operating
Systems).
.....
"You fertility deities are worse than Marxists," he said. "You think
that's all 
that goes on between people."

Roger Zelazny, Lord of Light. 1971.